filemembers.cxx

这是一个OPENH323中的MCU程序

/*
 * filemembers.cxx
 *
 * Various file-based Members for OpenMCU
 *
 * Copyright (C) 2003 Post Increment
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Post Increment
 *
 * Portions of ths code were written by by Post Increment (http://www.postincrement.com) 
 * with the assistance of funding from Stonevoice, slc. http://www.stonevoice.com
 *
 * Portions of this code were written by Post Increment (http://www.postincrement.com) 
 * with the assistance of funding from Citron Networks (http://www.citron.com.tw)
 *
 * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
 * All Rights Reserved.
 *
 * Contributor(s): Derek J Smithies ([e-mail])
 *                 Craig Southeren ([e-mail])
 *
 * $Log: filemembers.cxx,v $
 * Revision 1.1  2007/10/17 19:44:29  shorne
 * Initial Commit
 *
 * Revision 2.4  2006/08/02 06:24:53  csoutheren
 * Add provision for recording input audio
 *
 * Revision 2.3  2006/06/09 04:39:59  csoutheren
 * Migrated VideoBranch to main trunk
 *
 * Revision 2.2.2.5  2006/05/31 08:48:02  csoutheren
 * Fixed crash on second call when entry/exit files do not exist
 * Fix crash when Cisco HOLD used. Thanks to Christian Bongiovanni of Stonevoice
 *
 * Revision 2.2.2.4  2006/04/06 01:11:16  csoutheren
 * Latest sources include
 *   - premedia blanking and optional image display
 *   - ablity to defer conference join for authentication if required
 *   - more bulletproofing on conference join
 *   - new video copy/fill functions
 *
 * Revision 1.1  2006/03/31 07:36:12  craigs
 * New version with PINs and premedia blanking
 *
 * Revision 2.2.2.2  2006/03/28 05:13:38  csoutheren
 * Normalised file headers
 * Fixed problem with QCIF video
 * Seperated H.323 and MCU process functions into seperate files
 *
 * Revision 2.2.2.1  2006/03/06 05:45:30  csoutheren
 * Start of implementation for video. Still in progress
 *
 * Revision 2.2  2006/01/16 09:43:05  csoutheren
 * Fixed problem with crashes at end of playing files
 *
 * Revision 2.1  2004/05/26 06:54:31  csoutheren
 * Changed to be a PHTTPServiceProcess
 * Added ability to play WAV files on member entry and exit
 * Added additional documentation on all classes
 * Preparation for re-introducing video
 *
 */

#include <ptlib.h>
#include "conference.h"
#include "filemembers.h"

ConferenceSoundCardMember::ConferenceSoundCardMember(Conference * _conference)
#ifdef _WIN32
#pragma warning(push)
#pragma warning(disable:4355)
#endif
  : ConferenceMember(_conference, this)
#ifdef _WIN32
#pragma warning(pop)
#endif
{
  // open the default audio device
  PString deviceName = PSoundChannel::GetDefaultDevice(PSoundChannel::Player);
  soundDevice.Open(deviceName, PSoundChannel::Player, 1, 8000, 16);

  // start a thread to read from the conference and write to default audio device
  if (!soundDevice.IsOpen()) {
    thread = NULL;
    return;
  }

  running = TRUE;
  thread = PThread::Create(PCREATE_NOTIFIER(Thread), 0, PThread::AutoDeleteThread);

  conference->AddMember(this);
}

ConferenceSoundCardMember::~ConferenceSoundCardMember()
{
  Unlisten();
}

void ConferenceSoundCardMember::Unlisten()
{
  if (conference->RemoveMember(this))
    conference->GetManager().RemoveConference(conference->GetID());

  if ((thread != NULL) && running) {
    running = FALSE;
    thread->WaitForTermination();
    thread = NULL;
  }
}

void ConferenceSoundCardMember::Thread(PThread &, INT)
{
  PAdaptiveDelay audioDelay;
  PBYTEArray pcmData(480);
  soundDevice.SetBuffers(480, 3);

  while (running) {

    // read a block of data
    ReadAudio(pcmData.GetPointer(), pcmData.GetSize());

    // write the data to the sound card
    if (soundDevice.IsOpen())
      soundDevice.Write(pcmData.GetPointer(), pcmData.GetSize());

    audioDelay.Delay(pcmData.GetSize() / 16);
  }

  ConferenceManager & mgr = conference->GetManager();
  mgr.RemoveMember(conference->GetID(), this);
}


///////////////////////////////////////////////////////////////////////////

ConferenceFileMember::ConferenceFileMember(Conference * _conference, const PFilePath & _fn, PFile::OpenMode _mode)
#ifdef _WIN32
#pragma warning(push)
#pragma warning(disable:4355)
#endif
  : ConferenceMember(_conference, (void *)this), mode(_mode)
#ifdef _WIN32
#pragma warning(pop)
#endif
{
  filenames.push_back(_fn);
  Construct();
}

ConferenceFileMember::ConferenceFileMember(Conference * _conference, const FilenameList & _fns, PFile::OpenMode _mode)
#ifdef _WIN32
#pragma warning(push)
#pragma warning(disable:4355)
#endif
  : ConferenceMember(_conference, (void *)this), mode(_mode)
#ifdef _WIN32
#pragma warning(pop)
#endif
{
  filenames = _fns;
  Construct();
}

void ConferenceFileMember::Construct()
{
  thread = NULL;
  running = FALSE;

  // open the first file
  if (!QueueNext())
    return;

  running = TRUE;
  conference->AddMember(this);

  if (mode == PFile::WriteOnly)
    thread = PThread::Create(PCREATE_NOTIFIER(WriteThread), 0, PThread::AutoDeleteThread);
  else
    thread = PThread::Create(PCREATE_NOTIFIER(ReadThread), 0, PThread::AutoDeleteThread);
}

ConferenceFileMember::~ConferenceFileMember()
{
  Unlisten();
}

BOOL ConferenceFileMember::QueueNext()
{
  if (filenames.size() == 0)
    return FALSE;

  currentFilename = filenames.front();
  filenames.pop_front();
  if (!file.Open(currentFilename, mode))  {
    PTRACE(1, "Cannot open WAV file " << currentFilename);
    return FALSE;
  }

  PTRACE(1, "Playing WAV file " << currentFilename);

  return TRUE;
}

void ConferenceFileMember::Unlisten()
{
  if (conference->RemoveMember(this))
    conference->GetManager().RemoveConference(conference->GetID());

  if ((thread != NULL) && running) {
    running = FALSE;
    thread->WaitForTermination();
    thread = NULL;
  }
}

void ConferenceFileMember::WriteThread(PThread &, INT)
{
  PBYTEArray pcmData(480);
  PAdaptiveDelay audioDelay;

  while (running) {

    // read a block of data
    ReadAudio(pcmData.GetPointer(), pcmData.GetSize());

    // write to the file
    if (file.IsOpen())
      file.Write(pcmData.GetPointer(), pcmData.GetSize());

    // and delay
    audioDelay.Delay(pcmData.GetSize() / 16);
  }

  ConferenceManager & mgr = conference->GetManager();
  mgr.RemoveMember(conference->GetID(), this);
}

void ConferenceFileMember::ReadThread(PThread &, INT)
{
  PBYTEArray pcmData(480);
  PAdaptiveDelay audioDelay;

  while (running) {

    if (!file.IsOpen())
      break;

    // read a block of data from the file
    if (!file.Read(pcmData.GetPointer(), pcmData.GetSize())) {
      if (!QueueNext())
        break;
      else
        continue;
    }

    // read a block of data
    WriteAudio(pcmData.GetPointer(), pcmData.GetSize());

    // and delay
    audioDelay.Delay(pcmData.GetSize() / 16);
  }

  ConferenceManager & mgr = conference->GetManager();
  mgr.RemoveMember(conference->GetID(), this);
}